CN1902850A - Method and arrangement for ARQ data transmission - Google Patents

Method and arrangement for ARQ data transmission Download PDF

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Publication number
CN1902850A
CN1902850A CNA2004800393240A CN200480039324A CN1902850A CN 1902850 A CN1902850 A CN 1902850A CN A2004800393240 A CNA2004800393240 A CN A2004800393240A CN 200480039324 A CN200480039324 A CN 200480039324A CN 1902850 A CN1902850 A CN 1902850A
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China
Prior art keywords
pdu
transmitter
correct
code check
arq
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CNA2004800393240A
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Chinese (zh)
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P·拉松
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end

Abstract

The present invention relates to automatic repeat request (ARQ) in data communication. In the method according to the present invention a sender and a receiver are engaged in wireless communication with each other, wherein the sender is provided with an incoming data stream of a plurality of protocol data units (PDUs). The sender transmit a plurality of PDUs which are at least partially overlapping and at least two different transmission power levels are used for the transmission of at least two different PDUs.

Description

The method and apparatus of ARQ transfer of data
Technical field
The present invention relates to the automatic repetitive requests (ARQ) in the data communication.Especially, the ARQ that the present invention relates to fluctuate on the wireless channel uses.
Technical background
In most of communication systems, wireless communication system just most importantly provides a kind of reliable protocol of not having loss of data and data to duplicate from an entity transmission to another entity at least data cell of being used for.This reliable data transmission agreement especially depends on such principle, and data sink comes the response data transmitter with affirmative acknowledgement under the data conditions receiving, if and/or data unit loss then respond with negative response.If receive affirmative acknowledgement, transmitter will send next data cell subsequently, if perhaps receive negative response, the data cell of transmitter retransmits lost.
Automatically repetitive requests (ARQ) is a kind of in the retransmission technique the most frequently used in most communication networks, and guarantees user data transmission reliability and data sequence integrity.Before the transmission data, these data are divided into littler grouping, protocol Data Unit (PDU).Reliable transmission comes coding groups to realize by utilizing error-detecting code, thereby receiver can detect mistake or the grouping of losing and order are retransmitted like this.The integrality of data sequence normally reaches by continuous packet numbering and some transmission rule of application.
In the simplest ARQ form, be commonly referred to and stop first-class (Stop-and-Wait) ARQ, data transmitter is stored each packet that has sent and is waited for the affirmative acknowledgement that the mode with positive acknowledgement message (ACK) from the receiver of correct reception packet sends.When receiving ACK, transmitter abandons stored packet and sends next grouping.Message sequence chart among Fig. 1 a has schematically been described in the prior art and has been stopped-waited the ARQ scheme case.Fig. 1 b shows the processing procedure of the application that has typically replenished timer and negative acknowledgment message (NACK).Sending entity utilizes timer, and it is when data packet transmission, if do not receive ACK then retransmitted data packet before timer stops.If receiver detects mistake in grouping, it can send NACK to transmitter.Transmitter receives behind the NACK not, and waiting timer stops with regard to retransmitted data packet.If ACK or NACK information drop-out, timer will stop at last, and transmitter is with retransmitted data packet.In simply stopping-waiting, developed the detailed protocol of more traditional ARQ, for example (or selecting to retransmit) refused in Go-Back-N and selection, and it provides higher throughput.Given ARQ scheme in people's such as Dahlman WO 02/09342, it has increased the flexibility of traditional ARQ scheme by introducing the ARQ parameter, is provided with and/or consults the balance scheme about the communication resource that described parameter provides expectation.
Other direction in the ARQ development utilizes redundancy encoding to improve communication performance (measuring with throughput usually) in every way.These schemes are called hybrid ARQ scheme.Because the combination of coding and ARQ, hybrid ARQ scheme can provide some adaptation that wireless environment is changed, for example, for decay.It is very important how ARQ and encoding scheme being combined the antidamping channel best.Can advise and use a plurality of methods and scheme.
Forward error correction (FEC) combines with ARQ in mixing 1ARQ.In mixing 2AR0, more or less coding ground does not send PDU, but detects the Cyclic Redundancy Check that the bit mistake exists with being used for after decoding simultaneously.If the CRC failure promptly detects mistake, then request PDU is retransmitted, and sends the code word that generates based on the data that send together with first PDU.Described code word can have following feature, determines the primary data word independently by decodes codeword, or can be in conjunction with the PDU content of receiving before, and therefore improves the probability that is correctly decoded data word.This coding can adopt for example so-called half rate reversible code.The version that mixes 2ARQ can be used for UMTS.Another hybrid ARQ method is the repeatedly PDU of transmission (or similarly suppressing combination as disturbing) that combines with the maximum ratio combination.Disclose a kind ofly in conjunction with so-called turbo sign indicating number and method for Hybrid ARQ scheme in people's such as Ghosh United States Patent (USP) 6,308,294, it allows the repeating transmission of different sizes, and has strengthened the adaptability to attenuation channel.
Advantage as above-mentioned example has been provided in the ARQ scheme that provides, and it has increased throughput and/or flexibility for channel quality is provided.Yet the shortcoming that the method for prior art exists mainly is:
Traditional non-hybrid ARQ scheme, but also relate to hybrid ARQ scheme in a way is inefficent when channel quality changes when unpredictable.Described change can be fluctuateed caused by wireless channel because of decay, perhaps because decay or/and the unpredictable disturbance fluctuation of unpredictable traffic fluctuation causes.
Further, channel fluctuation may cause the wrong of channel measurement and/or out-of-date channel measurement may be used for link mode selecting.If disturb and noise greater than the selected speed of allowing, this may cause will can not be decoded with the grouping of this speed transmission.Alternatively, surplus can be introduced and utilization reduces speed, but this needs to use inefficiently the channel that can carry higher rate as " cost ".
In addition, comprehensive ARQ scheme, especially more advanced hybrid ARQ scheme, realization is very complicated, and needs the optimization of height to make full use of the throughput that may increase in theory.Usually the shortage to becoming very complicated system optimization, the hybrid ARQ scheme throughput still less that causes the wireless system transfer ratio to close.
Summary of the invention
A kind of improved ARQ method of significant need is fast with the change of adaptive channel quality automatically.
The purpose of this invention is to provide a kind of method, system and program that overcomes the prior art shortcoming.By as the defined method of claim 1, the system as claim 11 definition realizes as the defined equipment of claim 17 with as the defined program product of claim 9.
In according to method of the present invention, transmitter and receiver participate in mutual radio communication, and the input traffic of a plurality of protocol Data Units (PDU) wherein is provided for transmitter.Transmitter sends a plurality of partly overlapping at least PDU, and adopt at least two differently transmission power level transmit at least two different PDU.
An embodiment according to the inventive method comprises step:
A) PDU is divided into groups, wherein many PDU of the data flow of importing from transmitter are divided into the PDU group, and each PDU is provided a sequence number (n);
B) for PDU distributes transmitting power and code check, wherein each PDU is assigned with a transmit power levels value (P k) and a code check value (C k);
C) store these PDU, wherein the power stage value (P of these PDU and its sequence number (n) and distribution k) and code check value (C k) be stored in together in the memory,
D) send PDU, wherein the power stage value (P separately of the PDU in the PDU group k) and code check value (C k) send simultaneously from transmitter;
E) receive PDU, wherein the PDU of Fa Songing is received, is decoded by receiver and detects wrong (CRC), and thinking that the PDU that can not decode is identified as incorrect reception;
F) feedback (ARQ), wherein receiver sends the ARQ feedback with the form of ACK or NACK message to transmitter, and wherein said message comprises the PDU of correct reception or the information of the correct PDU that receives not respectively;
G) abandon the PDU of correct reception from memory, wherein transmitter abandons the PDU of the correct reception of interim storage from memory, and forms new PDU group, the PDU that it comprises the correct PDU that receives and comes from input traffic.
H) repeating step is b) to g), use the power stage higher to retransmit the incorrect PDU that receives thus than previous transmission.
Comprise that according to system of the present invention participation carries out the transmitter of RFDC and at least one receiver mutually, this system uses the automatic repetitive requests (ARQ) in the data communication, wherein provides the input traffic with a plurality of protocol Data Units (PDU) for transmitter.Transmitter is sent to the overlapping a plurality of PDU of small part, and uses two different transmission power level to send at least two different PDU at least.
The method and system of invention provides a kind of wireless channel that is suitable for about channel variation to adapt to.When channel allows, just can send the PDU of greater number, and instantaneous hanging down as if channel quality then sends less quantity.Wherein, this method guarantee in each transmission example the PDU that sends to small part can correct received probability will be very high, promptly almost always have some information to transmit.By contrast, in the prior art ARQ scheme (traditional with the scheme of mixing), in some cases, can transmit without any information.
An advantage of the invention is, because the Fast Channel adaptive capacity only needs still less channel feedback accurately in conjunction with some PDU correct high probability that receives in each the trial.In other words, the present invention has increased the robustness of resisting unpredictable channel fluctuation.In addition, this adaptation scheme is carried out has relatively low complexity, has guaranteed fast and the realization of reliability.
The further advantage that the method according to this invention provided is that it provides backwards compatibility for the conventional terminal in many communication systems.Its thought is that base station and new terminal are used new ARQ scheme, and conventional terminal is only searched this rough rank and to its decoding but because low layer (the considering the power magnitude) interference that PDU caused has some performances reductions.
In requiring, related right defined embodiments of the invention.In conjunction with the accompanying drawings and claim, the advantage of other purpose of the present invention and new feature will show from detailed Description Of The Invention subsequently.
Description of drawings
The present invention will be described hereinbelow in detail with reference to the accompanying drawings, wherein
Fig. 1 a) and b) be the message sequence chart of traditional ARQ scheme;
Fig. 2 is the flow chart according to the inventive method;
Fig. 3 is the message sequence chart according to the inventive method;
Fig. 4 explanation is according to the message sequence chart of the inventive method embodiment; With
Fig. 5 is the schematic diagram that is fit to the embodiment of structure of the present invention;
Fig. 6 has illustrated the method for using according to the present invention on channel, showed that the time changes decay.
Embodiment
In the typical scenario of using ARQ, two or more entities participate in mutual radio communication.Described communication is usually as mentioning on wireless channel, for example as the logic channel in the wireless communication system of UMTS.Described entity can send and receive radio signals.Clear in order to describe, the entity of described transmission data pay(useful) load is called transmitter, and the entity of described reception data is called receiver, even in ARQ handles, described entity also all receives and send signal on channel.Discuss as background technology part, decay fluctuation and disturbance fluctuation by the variation of traffic carrying capacity causes may cause channel quality to become unpredictable.Fig. 2 is illustrated is in typical traffic carrying capacity and attenuation, as " uncertainty " of the Carrier interference ratio (CIR) of probability density function.Can from figure, learn, can define an average channel quality, but in fact channel quality will depart from average quality very continually, can experience than the better and worse channel quality of average quality in the transmission in a moment.In the same way, if the channel quality of transient measurement with for referencial use, the probability that measures the atypia channel quality is quite high.In all wireless systems, carry out the measurement of channel quality, for example measure BER, and as the basis of determining transmitting power, link adaptation etc.As mentioned above, when channel quality changed unpredictablely, known ARQ scheme was a poor efficiency very.
Provide a kind of ARQ scheme according to method of the present invention, it is the situation of adaptive channel mass change well.According to this method, transmitter sends one group of a plurality of PDU in the identical time basically, and is multiplexing in different power stages and preferably have lower (sign indicating number) speed for each PDU.For organizing each the PDU 205 given sequence number n in 210 and distributing independent code check C nAnd independent power stage P nSelect code check and power stage, between the PDU of and all transmissions, can have noise and in disturbing middle decoding like this by receiver.The quantity of decodable PDU depends on noise grade, shown in 215, and the power of PDU reception.Preferably, for the PDU with lowest series numbering distributes peak power, and be that subsequently sequence numbering distributes next lower transmitting power.If the failure of the PDU decoding processing in the group is then retransmitted by ACK or NACK program command.Number for then the PDU lowest series of losing and send, and therefore use peak power.Alternatively, or can be in combination, the different coding of PDU given, promptly different data rates.
Various known modulation/multiplexing methods may be used to synchronous transmission, for example many minutes rectification (MRM), direct sequence CDMA DS-CDMA or " Turbo coding " CDMA.
Various known method also can be used for decoding, and for example Multiuser Detection (MUD) scheme comprises continuous interference eliminated (SIC), parallel interference elimination (PIC), Maximum Likelihood Detection or the like.
Based on realizing according to an embodiment who realizes ARQ method of the present invention, will referring to figs. 2 and 3 message sequence chart and the flow chart of Fig. 4 describe.Described method comprises step:
405: grouping PDU.
Many PDU from the transmitter input traffic are divided into the PDU group.According to n, n+1, n+2 ..., N+n-1 provides the sequence number of PDU respectively.The sequence number N of PDU in the group is respectively by using the demodulation/multiplexing method and the multiplexing of coding/decoding method and/or the ability of decoding to provide.Typical N is a predetermined value, but also can be a parameter.
410: for PDU distributes transmitting power and code check.
Each PDU is assigned with a transmit power levels value P kWith code check value C k, k=1 wherein, 2 ..., N.Preferably, distribute peak power magnitude value P for PDU with minimum sequence number (n) 1, and the power stage P that reduces for PDU sequence allocation subsequently gradually 2, P 3, P 4, or the like.Preferably, the value of the scope of power magnitude value from the value of the through-put power (measurement of respective channels quality) that is higher than the estimation needs to the through-put power that is lower than the estimation needs is to guarantee correctly to receive the high probability of PDU.With sending PDU lower correct sending probability will be arranged, but about the probability density function among Fig. 2, being appreciated that there is also the PDU that uses the through-put power lower than the through-put power of need estimating to send to be successfully received than low transmission power.
415: storage PDU.
PDU is together with the power stage value P of its sequence number n and distribution kWith code check value C kBe stored in the memory together.
420: send PDU.
PDU (n is to N-1) in the PDU group is with its power stage value P separately kWith code check value C kSend from transmitter simultaneously.
425: receive PDU.
The PDU that sends by receiver receive, decoding and error checking (CRC).Be typically the subclass of the PDU of correct reception.Remaining PDU is lower than noise level probably when sending, shown in Fig. 4 a, be construed to lose.Usually the subclass of the correct PDU that receives comprises PDU n subsequently, n+1, and n+2 ..., R, wherein R represents highest sequence number, corresponding lowest transmit power P R, it gives a correct PDU who receives.
The 430:ARQ feedback.
Receiver feeds back to transmitter with the form transmission ARQ of ACK or NACK message.Under the situation of ACK, message comprise the PDU in the PDU subclass of correct reception sequence number (typical, n, n+1, n+2 ..., R).Under the situation of NACK, message comprises not the sequence number of the correct transmission PDU that receives, promptly not in subclass (typical, R+1, R+2 ..., N+n-1).Alternatively, ACK or NACK message comprise the expression of R, represent that respectively the sequence number up to R is correct the reception, or the sequence number after the expression R do not receive correctly.
435: the PDU that from memory, abandons correct reception.
After receiving ACK or NACK message, transmitter abandons the PDU of the correct reception of interim storage from memory, i.e. subclass n, and n+1, n+2 ..., R.The new group of recombinating, wherein minimum sequence number is given the correct PDU that receives (R+1, R+2 ..., N+n-1), and thus will be to its maximum transmission power magnitude value.Use then from input traffic R+1, R+2 ..., this group of new PDU " filling " of N+n-1 unit.
440: repeating step 410 to 435.
All PDU duplicate allocation in the input traffic, transmission and ARQ are handled.
Rely on the result of PDU group transmission, total power stage, maximum power levels P 1, the interval between power stage and the code check value can be adjusted between the group transmission.
The explanation of the message sequence chart of Fig. 3 be example according to the inventive method, four possible synchronous transmission (N=4) are arranged, i.e. four power stage P 1, P 2, P 3And P 4First group comprises PDU 1, PDU 2, PDU 3And PDU 4(step 405) has the power stage P of distribution 1, P 2, P 3And P 4And code check C 1, C 2, C 3And C 4(step 410).Transmission (step 420) produces has only PDU 1, PDU 2By correct receive (step 425).Receiver sends NACK message and informs transmitter PDU 3And PDU 4Lose (step 430).At the PDU of transmitter place 3, PDU 4, PDU 5And PDU 6Form a new PDU group (step 435), respectively with power stage P 1, P 2, P 3And P 4Send.
The relation between power stage, the coding and the relation of interference plus noise level depend on modulation and encoding scheme and decoder architecture.The property example can be supposed to utilize based on the receiver of shannon limit near sign indicating number and continuous interference eliminated as an illustration.Further, for simpler, can suppose that each PDU can regard a white noise sequence without any structure as.Can further suppose the speed that determines that each grade should use, use C here kExpression, wherein the scope of k is 1 to K.In addition, PDU can be decoded in certain SNR level, or be equal to decoded in certain interference level threshold value.Now, suppose described threshold level I kExpression.So for the power stage P of each grade kCan be definite like this:
C N = lg 2 ( 1 + P N I N ) , C N 1 = lg 2 ( 1 + P N - 1 I N - 1 + P N ) , C k = lg 2 ( 1 + P k I k + Σ j = k + 1 N P j )
As shown in Figure 5, a possible example structure wherein uses the multiresolution modulation to come with the multiplexing different ARQ PDU of different levels.Unmodulated data flow 505 enters transmitter unit 510.In ARQ TX part 515, PDU to be made up in groups and distributing independent transmitting power and/or code check (step 405 and 410), coding and modulating part 520 utilizations are subsequently encoded PDU as FEC+CRC and are modulated.ARQ TX part 515 further comprises a memory module 517, wherein stores a PDU (step 415) and a discard module 518 (step 435) when waiting for ARQ feedback (step 430) temporarily.Signal carries out mixing and combination by frequency mixer 525 and combiner 530, and sends (step 420) on the interface aloft as modulating data 535.
At receiving terminal, receiver 540 receives the data (step 425) of being modulated.Recover each PDU and determine that by the CRC function which PDU is not correctly received in decoded portion 545.PDU enters ARQ RX part 550, and it retransmits incorrect PDU (step 430) according to ARQ feedback 552 order ARQ TX 515.From receiver 540 output be demodulating data 555, correspondence is demodulating data 505 not.
ARQ method under Fig. 6 has illustrated and operated in the time domain of attenuation channel according to the present invention, wherein coherence time is greater than the time slot duration that is used for sending PDU.As shown in the figure, the quantity of the correct PDU that receives is in time to change along with the variation of radio channel and interference.
The present invention mainly illustrates according to flat channel.Yet, the also channel that can be used to change, as have the OFDM of frequency selectivity.
In addition, the PDU that decodes in a time example can cancel from baseband signal.Remaining then baseband signal can be used for the combination of new received signal, for example maximum ratio combination.
Described classification ARQ scheme also can be used in conjunction with other hybrid ARQ method, by utilizing different FEC codings for identical PDU, rely on whether be PDU send first, second, third (or the like) time.
The present invention also can be used in conjunction with senior antenna concept, includes but not limited to form and MIMO as the wave beam based on communication.
Can be described as providing a radio channel according to method of the present invention, be applicable to that the variation one of channel can transmit the PDU of greater number when channel allows, if the low PDU that can only transmit smaller amounts of instant channel quality.Thus, this method guarantees in each transmission example, the PDU that sends to small part can correctly be received probability will be very high, promptly almost always transmit some information.By contrast, in the prior art ARQ scheme (traditional with the scheme of mixing), in some cases, can transmit without any information.
Alternatively, or combine with above-mentioned, Fast Channel adaptive capacity provided by the invention, can be used in needs in the less accurate channel feedback, because the present invention has increased the robustness of resisting unpredictable channel fluctuation.In addition, lower complexity is carried out the described adaptive rapid and reliable realization of guaranteeing.
According to method of the present invention, for the conventional terminal in most of communication system provides backwards compatibility.Can realize new ARQ scheme in base station and new terminal, wherein conventional terminal is only checked power stage and same decoding roughly, perhaps because the interference that following (about power stage) PDU causes can reduce performance a little.
According to method of the present invention, preferably realize by the equipment of program product or program module product, comprise the software coding equipment that is used to carry out described method step.Described program product is preferably carried out in a plurality of entities in network.Described program is issued and is loaded from computer-readable medium, floppy disk for example, and CD, or aerial transmission, or download from the internet.
Invention has been described in conjunction with thinking most realistic and most preferred embodiment at present, is appreciated that the present invention is not limited only to the disclosed embodiments, and on the contrary, its purpose is to cover various distortion and the scheme that be equal in the claim.

Claims (21)

1. one kind in transmitter that participates in mutual radio communication and automatic repetitive requests (ARQ) method in the data communication between the receiver, wherein provide input traffic with a plurality of protocol Data Units (PDU) to transmitter, it is characterized in that as described a plurality of PDU when transmitter sends overlappingly at least in part, utilize at least two different transmission power level to transmit at least two different PDU.
2. according to the ARQ method of claim 1, wherein in a plurality of PDU transmission, at least two different code checks are used at least two different PDU.
3. ARQ method according to claim 1 and 2, if wherein some transmission PDU from transmitter are not received device and correctly receive, then receiver is failed correct the reception with which PDU of notice transmitter, and transmitter is retransmitted the correct PDU that receives with the power stage different with the power stage used in the transmission attempt first time.
4. according to each described ARQ method of claim 1 to 3, if wherein some are not received device from the PDU that transmitter sent and correctly receive, then receiver is failed correct the reception with which PDU of notice transmitter, and transmitter is retransmitted the correct PDU that receives with the code check different with the code check that uses in the transmission attempt first time.
5. according to each described ARQ method of claim 1 to 4, at least one the power stage value that wherein is used to transmit at least one PDU is lower than estimated level of noise.
6. according to each described ARQ method of claim 1 to 5, wherein said method comprises step:
A) PDU is divided into groups (405) wherein many PDU of the data flow of importing from transmitter are divided into the PDU group, and each PDU is provided a sequence number (n);
B) for PDU distributes transmitting power and code check (410), wherein each PDU is assigned with a transmit power levels value (P k) and a code check value (C k);
C) store this PDU (415), wherein the power stage value (P of PDU and its sequence number (n) and distribution k) and code check value (C k) be stored in together in the memory,
D) send PDU (420), wherein the PDU in the PDU group uses power stage value (P separately in essence k) and code check value (C k) send from transmitter simultaneously;
E) receive PDU (425), wherein the PDU of Fa Songing is received, is decoded by receiver and detects wrong (CRC), and thinking that the PDU that can not decode is identified as incorrect reception;
F) feedback (430), wherein receiver sends the ARQ feedback with the form of ACK or NACK message to transmitter, and wherein said message comprises respectively about the PDU of correct reception or the information of the correct PDU that receives not;
G) abandon the PDU (435) of correct reception from memory, wherein transmitter abandons the PDU of the correct reception of interim storage from memory, and forms new PDU group, and it comprises the correct PDU that receives.
7. according to the ARQ method of claim 6, repeating step b wherein) to g) (440), and the correct PDU that receives is placed in subsequently the sequence, respectively to be higher than the power stage value (P that uses in the transmission for the first time in transmission for the first time k) and/or different code check value (C k) transmit.
8. according to the ARQ method of claim 7, wherein in allocation step (410), distribute the power stage of successively decreasing to PDU, so that the PDU with minimum sequence number is provided peak power level value about its sequence number; And in this step, the PDU that fails correctly to receive is provided minimum sequence number, use new PDU to fill this group from input traffic.
9. the computer program in the internal storage that can directly be loaded into the treatment facility in transmitter and the receiver comprises the software coding device that is used to control the described any step of claim 1 to 8.
10. a computer program that is stored on the computer usable medium comprises readable program, is used for making the execution of the described any step of treatment facility control claim 1 to 8 in transmitter and the receiver processing unit.
11. system with at least one transmitter (510) and at least one receiver (540) of being suitable for participating in mutual RFDC, this system utilizes automatic repetitive requests (ARQ) in data communication, wherein provide input traffic with a plurality of protocol Data Units (PDU) for transmitter, it is characterized in that transmitter is arranged to send a plurality of partly overlapping at least PDU, and utilize at least two different transmission power level to transmit at least two different PDU.
12. according to the system of claim 11, wherein in a plurality of PDU transmission, at least two different code checks are used at least two different PDU.
13. according to claim 11 or 12 described systems, if wherein some transmission PDU from transmitter are not received device and correctly receive, then receiver is failed correct the reception with which PDU of notice transmitter, and transmitter is retransmitted the correct PDU that receives with the power stage different with the power stage used in the transmission attempt first time.
14. each described system according to claim 11 to 13, if wherein some transmission PDU from transmitter are not received device and correctly receive, then receiver is failed correct the reception with which PDU of notice transmitter, and transmitter is retransmitted the correct PDU that receives with the code check different with the code check that uses in the transmission attempt first time.
15. according to each described system of claim 11 to 14, at least one the power stage value that wherein is used to transmit at least one PDU is lower than estimated level of noise.
16. according to each described system of claim 11 to 15, wherein transmitter comprises:
Apparatus for grouping (515), be used for PDU is divided into groups,, each PDU provided a sequence number (n) so that many PDU of the data flow of importing from transmitter are divided into the PDU group, and for PDU distributes transmitting power and code check, so that each PDU is assigned with a transmit power levels value (P k) and a code check value (C k), described apparatus for grouping is used to receive the ARQ feedback;
Storage device (517) is used to insert described apparatus for grouping (515), and the power stage value (P of storage PDU and sequence number (n) and distribution k) and/or code check value (C k);
Dispensing device (530) is used to send PDU, so that the PDU in the PDU group uses power stage value (P separately in essence k) and code check value (C k) send from transmitter simultaneously;
Drop device (518) is used to insert described apparatus for grouping (515), abandons the PDU of correct reception among the PDU of the correct reception of interim storage from memory, and forms new PDU group, and this new PDU group comprises the incorrect PDU that receives,
Wherein receiver comprises:
Be used for receiving, decode and check (545) PDU mistake (CRC) and will think that the PDU that can not decode is identified as the correct device that receives;
Feedback device (550) is used for giving transmitter with ACK or NACK message feedback, and wherein ACK or NACK message comprise respectively about the PDU of correct reception or the information of the correct PDU that receives not.
17. one kind be suitable for participating in and at least another radio communication equipment carry out the radio communication equipment of RFDC mutually, described equipment utilizes automatic repetitive requests (ARQ) in data communication, wherein provide input traffic with a plurality of protocol Data Units (PDU) for the transmitter unit of radio communication equipment (510), it is characterized in that first radio communication equipment comprises transmitter unit (510), it is used to send a plurality of partly overlapping at least PDU, and utilizes at least two different transmission power level to transmit at least two different PDU.
18. according to the radio communication equipment of claim 17, wherein radio communication equipment comprises transmitter unit (510), it comprises:
Apparatus for grouping (515), be used for PDU is divided into groups,, each PDU provided a sequence number (n) so that many PDU of the data flow of importing from transmitter are divided into the PDU group, and for PDU distributes transmitting power and code check, so that each PDU is assigned with a transmit power levels value (P k) and a code check value (C k), described apparatus for grouping is used to receive the ARQ feedback;
Storage device (517) is used to insert described apparatus for grouping (515), and is used to store the power stage value (P of PDU and sequence number (n) and distribution k) and/or code check value (C k);
Dispensing device (530) is used to send PDU, so that the PDU in the PDU group uses power stage value (P separately in essence k) and code check value (C k) send from transmitter simultaneously;
Drop device (518) is used to insert described apparatus for grouping (515), abandons the PDU of correct reception among the PDU of the correct reception of interim storage from memory, and forms new PDU group, and this new PDU group comprises the incorrect PDU that receives.
19. according to claim 17 or 18 described radio communication equipments, wherein radio communication equipment comprises receiving element (540), it comprises:
Be used for receiving, decode and check (545) PDU mistake (CRC) and will think that the PDU that can not decode is identified as the correct device that receives;
Feedback device (550) is used for giving transmitter with ACK or NACK message feedback, and wherein ACK or NACK message comprise respectively about the PDU of correct reception or the information of the correct PDU that receives not
20. according to claim 17 or 19 described radio communication equipments, wherein radio communication equipment is the portable terminal that is used for cellular radio communication system.
21. according to claim 17 or 19 described wireless energising letter equipment, wherein radio communication equipment is the radio base station that is used for cellular radio communication system.
CNA2004800393240A 2003-12-29 2004-12-23 Method and arrangement for ARQ data transmission Pending CN1902850A (en)

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DE602004010433D1 (en) 2008-01-10
US7724640B2 (en) 2010-05-25
EP1700411A1 (en) 2006-09-13
DE602004010433T2 (en) 2008-10-16
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ATE379892T1 (en) 2007-12-15
TWI383614B (en) 2013-01-21

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